IB Design Technology (DT) SL Extended Essay Example

The student communicates a worthwhile topic clearly and sustains a coherent line of inquiry from greywater reuse to a site-specific design proposal.

The student's research question stays connected to the main investigation, and the final conclusion returns to it directly.

The student selected several relevant methods, including an expert interview, a site visit, case-study research, and contextual calculations.

The student's research question is still broader than it needs to be, especially in how it uses terms like sustainability and effectiveness.

The method would be stronger if the student stated their interview focus, source-selection process, and comparison criteria more explicitly.

Some of the narrowing to the Singapore site happens later in the report rather than being embedded in the original framing.

The student shows good subject knowledge across greywater treatment, water reuse, membrane processes, disinfection, and centralized wastewater systems.

The student uses technical vocabulary confidently and usually accurately, which helps the report sound informed and specific.

The student connects source material to the proposed design in a way that shows understanding of how the systems work in practice.

Some important claims and numerical inputs are not traceable enough in the report body, which weakens the reliability of the student's evidence use.

A few technical explanations need more precision, especially where process chemistry or treatment outcomes are described too confidently.

The student sometimes relies on source material without enough discussion of bias, transferability, or local applicability.